SEDL / STP / STP422-EB / STP41305S

Deflection and Failure of Steel-Supported Floors and Beams in Fire

Harmathy, T. Z.
Research Officer, Fire Research Section, Division of Building Research, National Research Council, Ottawa,

Pages: 23    Published: Jan 1967

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Abstract

Some basic information concerning the deformation of solids is discussed briefly. In addition to presenting some practical data, a theory is also outlined. This theory may be characterized as an expansion of Dorn's creep theory into a form applicable to the calculation of deformation processes at variable temperatures and stresses. Rigorous and simplified techniques are described for the calculation of the deflection of joists and beams during fire exposure and temperature criteria of structural failure are developed. For an A 36 steel beam, for example, the criterion of failure is T^αc = 70,000/45.62-4.23(Id/I) 460 (in deg F) An obvious shortcoming of ASTM Methods E 119 is pointed out.